Al·tair (āl-tīr', -târ', āl'tīr', -târ') n. A very bright, variable double star in the constellation Aquila, approximately 15.7 light-years from Earth.
[Arabic (an-nasr) aṭ-ṭā'ir, the flying (eagle) : al-, the + ṭā'ir, flying, active participle of ṭāra, to fly; see ṭyr in Semitic roots.]